Learn to unit test C/C++ applications using the CPPUnit unit testing framework. Designing software with unit testing in mind may yield better software – the programmer is forced to isolate components. Easy refactoring of code. The unit test is. CppUnit is a unit testing framework module for the C++ programming language. It allows unit-testing of C sources as well as C++ with minimal source.

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This module coded as a class called DiskData has two main responsibilities: But when I tried to port an application on VC7 then all of a sudden the code crashes.

Then, the Test Case code will be executed using our fixture object, and finally we destroy cppunir object inside tearDown, after each Test Case execution. NET platformand many others. Our testing unit should be coded with another module, that is: In this way, we get a new, fresh object each time we execute a test case. Let’s take a look:. I’m going to consider that you know what unit testing is, and why it is very important in the software development process.

For example, we can code another Test Case to check our module behavior with typical addition properties:.

Unit Testing with CPPUnit

When our newly coded test can reproduce the cpphnit properly, titorial can fix it, and perform the test again. Each time a team wants to deploy a new release, it should perform a complete unit tests battery. For instance, we’ve written a small module that stores some data on a disk. A programmer is testing his or her code by using the debugger. Each test compares the addition result with expected value, and it returns FALSE if the result is a value that is different than the expected one.


This pointer will hold the target object of our tests. We’re going to test our DiskData class, which mainly performs two operations: By coding “unit tests” before its development, you’re getting this set of knowledge, and, when you code the main unit, you’ll be able to develop faster and better than the other way.

CppUnit: C++ unit test framework

Gates Bill What are u tallking about? We need an auxiliary file that stores one correct DATA structure. Thanks for your registration, follow us on our social networks to keep up-to-date. Protected methods implement our test logic, one for each Test Case.

We’re going to fill our fixture data with known data, store it in another temporal disk file, and then open both files new and auxiliary oneread them, and compare the contents. By running step by step, you can verify whether a variable has the expected value. You can get latest CPPUnit version herewhere you can find all libraries, documentation, examples, and other interesting stuff. For now, it isn’t important how these methods are coded because the most important thing is that we must be sure this class is doing all the things it must do, that is: All these frameworks apply similar rules, and probably you can use one if you’ve used another one, with few language-dependent exceptions.


In our test case, we should compare internal data with the external file data to cppunt that they’re the same. If the execution path reaches the last line, we consider that all tests have been cppinit correctly, and it returns TRUE.

In this case, we check how “addition operation” behaves about the operand’s sign.

If at least one unit doesn’t pass all its tests, we’ve found a bug. We made all kinds of verifications, such as buffers’ and files’ sizes or buffers’ contents. Both files should be identical because the store method must generate the same file structure. Containerized Development with Docker. Implementation is very simple for now: Here are some assertion macros:.

CppUnit – The Unit Testing Library

All units must pass their unit or acceptance tests, and in this case, we can release a successful new version. Once tests are registered and added to the runner, we can show the dialogs with the run method.

Following with our example, we should code our loadTest method.